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Property Plant and Equipment (Summary of Carrying Amounts of Major Classes of Assets and Liabilities Classified as Held for Sale) (Detail) - Fairless and Manchester $ in Millions | Sep. 30, 2018 USD ($)
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Assets: |
Current assets | $ 37
Property, plant and equipment, net | 940
Other assets | 52
Total assets | 1,029
Liabilities: |
Current liabilities | 8
Asset retirement obligation | 1
Total liabilities | $ 9

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